Impulse sender



G. THOMPSON. IMPULSE SENDEH. APPLICATION mfp Nov. 3, 1919.

Patented Oct. 24;, 1922,

[wen/nn @ep/fg@ 7770/77/550/7 ,by @ff/@ .50 line C. These contact springs, together with from the switchhook. However, for the 105 -5 an insulating material 17 The member 1i 3 impulses respectively, at each actuation of 110 retenes oei. as, icas. lnt@ 'if mi' GEORGE THOMPSON, OF MOUNT VERNON, NEV YORK, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, O1 NEX/V YORK, N. Y., A CORPORATION OF NEVI YORK.

IMPULSE SENDER.

Application led November 3, 1919. Serial No. 335,289.

To all whom t may concern: extends up through the post portion elof the Be it known that I, GEORGE THOMPSON, a` standard and is suitably secured to the basic citizen of the United States, residing at member thereof.

Mount Vernon, inthe county of Westchester A ratchet wheel 18, together with an im- 5 and lState of New York, have invented cer-v pulse wheel 19 having a series of cam teeth, 60 tain new and useful Improvements in Imis secured to the portion of the switchhook pulse Senders, of which the following is a that is mounted within the casing i by full, clear, concise, and eXact description. means of a suitable rivet Q0. The impulse This invention relates to an impulse-sendwheel 19 is so attached to theratchet wheel 1o ing device which is adapted to be used in 1S that any movement thereof will cause a 65 connection with telephone exchange systems similar movement of the impulse wheel. where it is desired to differentiate between The niunber and arrangement oi the teeth the parties making a call. n on the impulse wheel will be in accordance The principal object of the invention is with the designation ot the station at which the provision of means, beyond the control it is to be used. The ratchet wheel I8 is ar- 70 of the calling stibscriber, for transmitting a ranged with an operating pawl 2l for endeh'nite series of'impulses over the line. gaging `the teeth thereof. Thepawl 2l is In accordance with a feature of the insecured to the switchhook 7, whereby `when vention, said means is provided inconjuncthe switchhook is caused to assume a position with the switchhook of the subscribers tion other than its normal position, the 75 set and is put into an operative condition ratchet wheel 18 will be caused to advance a upon the removal of the receiver from the step. switchhook. L i v The contact spring 13,1vliich is normally It is thought that a more definite under in engagement with contact spring 1Q, has

standing of the invention may be had from its upper portion so arranged to engage 80 the following description taken in conjuno the teeth oi the impulse wheel 19. it is thus tion lwith the accompanying drawing in seen that when the ratchet wheel 18 is caused which Fig. 1 shows Va telephone line having to be revolved by an upward movement of a plurality of stations connected therewith -the switchhook T for causing a similar movewhere a telephone set is located, in which ment of the impulse wheel 19, that the con- 85 there is provided means whereby it is postact spring 13 will be caused to ride over the sible to differentiate between the various teeth of the impulse wheel. The number of parties located on the line. In Fig. 2 there times that the contact between the contact is shown a sectional view taken across the springs 12 and 13 is made and broken, will,

line Qr-Z. i p of course, depend upon the number of teeth 90 In the drawing in which the same referover which the contact spring 1? is caused ence characters represent like parts, 4 repre to ride.

scnts a telephone set which is provided with The number teeth which the impulse the usual transmitter 5 and receiver 6, the wheel must necessarily be provided with receiver 6 being adapted to be supported will depend upon the number of parties 95 pendently by means of a switchhook 7. The connected with the telephone line, referring, switchook 7 is L-shaped and has a portion of course, to a party line to which the inthereof, as designated by the numeral 8, ventionis especially applicable. If the devwhich maintains contact spring 9 out of envice is applied to a part-y line, the set sup gagement with Contact springs v10 and/11 as plied to party I would not be equipped with 100 long las the receiver is on the switchhook. an impulse wheel as the single impulse neces- The closure of contact springs -10 and 11, sary for conditioning the energizing circuit upon the release of contact spring 9, conof the operating magnet I will be transnects the telephone set with the telephone mitted upon thel removal of the receiver Cri the normally engagedcontact springs 12 and other parties on the line different impulse 13, are secured to a member 14. by means of wheels must be provided having 1, 2 and 3 bolts 15 and 16. The various contact springs teeth respectively, for each tooth on the are insulated from one another by means of ratchet wheel 1S, so as to transmit 1, 2 and the switch'hooli. lt isobvious that this ai` 'rangement is capable olf being applied to a telephone line having any number of subscriber sets connected therewith.

Theoperation of a device of the character as applied to an automatic telephone eX- change system, is as follows: Let us assume that party lV, which is kthe 'fourth party on the line, desires to initiate a call, in which case the impulse wheel 19 will have ltour teeth -to Yeach tooth oft the fatchet wheel 19. The subscriber, :in i-emoving`-l his receiver from the switchhook in the `usual manner, causes ratchet wheel lS to be moved from its position ol rest and stepped around one step, `so 'that the following tooth will be engaged by the pawl 2l. The removal of the receiver from the switchhook also causes the release ot contact spring 9 lor actuating contact springs l() and 11 thereby connecting the set with the line ll. The movement oi: the ratchet wheel 1.8 in this manner,'thereby causes a similar n'iovemeut oi .the impulse wheel 1,9 which causes the disengagement ol the contact springs and 13 and the consequent sending o'lithe preliminary impulses. The'transmission ol" these impulses thereby causes the operation o'l" relay `22, the energizing circuit of which extends from battery through the lett-hand winding ot vrelay 22, left-hand normal Contact of cut-oli' relay 23, contacts of sender 3G (not shown) closed contacts ot contacts springs 13, 12, 9, 10a-nd l1, Conductor 24, right-hand normal contact ofcut-oll relay 23 and the right-hand winding of relay 22 to ground. Relay 22, on being energized, attracts its armature25, movin'ga stepping pawll `26. The stepping pawl 26 thereby moves the ratchet wheel 2l carrying an arm 28, into engagement with contact 29 which is associated with the operating magnet I klor preparing an operating circuit for the message register individual to the subscriber. The ratchet wheel 2T `is he'ld .in its actuated position by `means ol1 a holding pawl 35. '(ontacts 30, 3l and 32 are contacts associated with the operatingmagnets ll, lll and IV, and the registers individual thereto. rll'he operating magnets control the registers by attracting .an armature 33 carrying a stepping pawl which steps the register wheel 34 one step 'for Aeach energization of the operating magnet;

rThere are also three other preliminary impulses or interruptions oi' the energizing 4circuit of relay 22, produced by the breaking oi the circuit through contacts 12 and 13 :by the impulse wheel 19. The arm 28 is thereby moved from one contact to the other until it reaches contact 82 where it is .brought to rest due .to the Venergimtion of relay 22 which now pulls up its armature lfor a longer period of time in which the energization of relay 22 establishes, at .its left-hand contact, a circuit for causing the operation of.'

slow to operate relay Lil). Upon the operation ol' slow to operate relay 4lO,-the energizing circuit of the eleotromagnet controlling the operation of a selector (not shown) for selecting' an idle trunk is completed through the alternate contacts of this relay. Relay 4l() is of the slow to operatev type since it is not desired to operate the selector switch `on ythemomentary operation of relay 22 for advancing the element 28 into engagement with the desired `one ofthe contacts associated with the 4message register. The selector switch seizing an idle trunk, thereby'causes the energization or' cut-ofi relay 423, Vwhich `disconnects relay 22 trom the line conductors for causing 'the'fdeenergization thereof. The subscriber can, at 'this time, 4operate -his sender '36 i'or vcausing the operation or' the apparatus of the central oillce Ifor 4connecting his line Lwith vthe line g oil the called-igor party. The called-flor party, in answering Ethe call by ri-einov-ing the receiver from the switclihook, sets up 4acondition `on cond uctor 37 which causes Vthe energiaatfion of loperating magnet IVvflior actuating "the message register. The energizing circuit thereof maybe `traced fi'roiu battery through the winding of vmagnet 4, contact 32, arm 28 and conductor 37 to ground Vat the central office (not shown).

@n the release of the selector switch at the central ofice, cut-off relay -23 is 'de energized and thereby withdraws theholding pawl from, engagement with the ratchet wheel 27, uwhereupon arm 28 returns 100 to normal.

The invention, as described herein, 'has been applied to an lautomatic telephone system but it 4is obvious 'that it may be employed in systems of other types in lwhich 105 `is desired to differentiate between the various parties of Ya `party lline for operating the message registers individual to eachvone of the parties Jon that line.

lllhat is claimed is:

l. The combination with -a telephone set ol a switchhoolr,v a ratchet wheel associated with and directly Vunder the control off said switchhool', Aan impulse wheel operated by said ratchet wheel due to an upward 'move- 115 ment of said sw-itchhoolr, a-nd Contact springs actuated by-said impulse wheel `for sending preliminary impulses. i

2. The combination with a telephone set of means for automatically sending prelimi- I120 nary impulses, said means comprising an interruptor, `a switohhook, and la ratchet wheel controlled solely *by said switchhook to operate the interrupter.

3. The combination with a telephone set 125 of means 'for automatically sending 4preliminary impulses, said means comprising a switc'hhook, Contact springs, an impulse wheel arranged in close f'proXimi-ty to said contact springs, and means controlled sole- 130 ly by said switchhook for causing the rotation of said impulse Wheel, and in"conse quence thereof, the actuation of said contact springs.

Il.' The combination with a telephone set springs.

5, The combination with a telephone set of an interrupter mechanism arranged in conjunction with thes'witchhook for auto-A matically sending preliminary impulses, said interrupter mechanism comprising Contact springs,an impulse Wheel mounted in close proximity to said Contact springs, and means controlled entirely by the sWitchhook for `causing the rotation of said impulse Wheel,

and in consequence thereof the actuation of said Contact springs.

In'. Witness whereof, I hereunto subscribe my name this 31st day ofOctober, A. D.,

y1919. thereof, the actuation of said contact GEORGE THOMPSON. 

